Hi ALL, I need to control the temperature of a furnace. The Thermocouple ouputs are available as RS-485. What Hardware and system configuration should I prefer?

I need to automate the control of a gas carburising furnace. The available signals are Thermocouple K-Type (4 nos., one each from the three zones and one from the geometrical center of the furnace) and Oxygen Analyser. That makes it a total of 5 signals, all available in RS-485 format, which I need to acquire (10 samples/second) and then initiate a control action as per the rule base. Reliability is a major issue and the system has to work in harsh conditions.
What hardware would suit my purpose? I would prefer NI hardware which can be programmed via VB or VC++. LabVIEW may be considered as the last option.
Ap
art from using the thermocouple/Oxygen analyser signals for controlling it is also desired to store them on a PC for analyses and visualisation (via graphs etc etc)
My need is URGENT and would appreciate any help. Thanx in advance
Gurdas

Hi Gurdas,
I can give you some ideas to start with:
- a cheap solution - a rs232/rs485 converter(http://www.rs485.com/pconverters.html) and do the code in VB [you have to do both communication and data management)
- a medium solution - a AT-485 or PCI-485 NI board (I think that you'll get some NI libraries to control it from VB/VC++) [just data]
- a better solution - a LabVIEW or Measurement Studio with a NI 485 card in order to avoid wasting time with too much programming
- a much better solution - LabVIEW/Measurement Studio with an ENET-485 NI card (of course, you'll need a network passing by your lab :-))
Regarding harsh conditions, I think that rs485 allows you to stay far enough.
Hope this helps somehow.

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Hi ALL, I need to control the temperature of a furnace. The Thermocouple ouputs are available as RS-485. What Hardware and system configuration should I prefer?

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